Indeterminate, major
Sedimentary
Igneous
Metamorphic
Bed
Unconsolidated
Coarse-detrital
Gravel
Unconsolidated
     Coarse-detrital
          Gravel
Sand
Unconsolidated
     Coarse-detrital
          Sand
Fine-detrital
Silt
Unconsolidated
     Fine-detrital
          Silt
Clay
Unconsolidated
     Fine-detrital
          Clay
Peat
Unconsolidated
     Peat
Major
Mass
Ice
Glaciers and perennial ice fields
Lake, stream, or ocean
Water
Water bodies shown on geologic maps
Swamp
Unconsolidated
     Fine-detrital
Colluvial
Unconsolidated
     Coarse-detrital
Minor
Boulders
Unconsolidated
     Coarse-detrital
          Boulders
Incidental
Landslide
Alluvial
Terrace, stream
Beach
Estuarine
Terrace, marine
Chemical
Sedimentary
     Chemical
Eolian
Eolian, Loess
Lacustrine
Glacial
Glacial, rock glacier
Solifluction
Glacial, esker
Glacial, outwash
Glacial, drumlin
Terrace
Glacial, till
Reef
Carbonate
Limestone
Sedimentary
     Carbonate
          Limestone
Clastic
Siltstone
Sedimentary
     Clastic
          Siltstone
Conglomerate
Sedimentary
     Clastic
          Conglomerate
Sandstone
Sedimentary
     Clastic
          Sandstone
Pyroclastic, tuff
Volcanic
Mafic-volcanic
Basalt
Igneous
     Volcanic
          Mafic-volcanic
               Basalt
Tailings
Flow
Felsic-volcanic
Igneous
     Volcanic
          Felsic-volcanic
Igneous
     Volcanic
          Mafic-volcanic
Pyroclastic
Igneous
     Volcanic
Andesite
Igneous
     Volcanic
          Mafic-volcanic
               Andesite
Dacite
Igneous
     Volcanic
          Felsic-volcanic
               Dacite
Dome
Basaltic-andesite
Igneous
     Volcanic
          Mafic-volcanic
               Basaltic-andesite
Rhyolite
Igneous
     Volcanic
          Felsic-volcanic
               Rhyolite
Pyroclastic, ash-flow
Pyroclastic, air fall
Volcaniclastic, lahar
Volcaniclastic
Tuffaceous
Graywacke
Sedimentary
     Clastic
          Sandstone
               Graywacke
Pyroclastic, cinder cone
Hypabyssal
Mafic-hypabyssal
Hypabyssal-basalt
Igneous
     Hypabyssal
          Mafic-hypabyssal
               Hypabyssal-basalt
Stock or pipe
Felsic-hypabyssal
Hypabyssal-dacite
Igneous
     Hypabyssal
          Felsic-hypabyssal
               Hypabyssal-dacite
Hypabyssal-rhyolite
Igneous
     Hypabyssal
          Felsic-hypabyssal
               Hypabyssal-rhyolite
Hypabyssal-andesite
Igneous
     Hypabyssal
          Mafic-hypabyssal
               Hypabyssal-andesite
Dike or sill
Igneous
     Hypabyssal
          Mafic-hypabyssal
Igneous
     Hypabyssal
          Felsic-hypabyssal
Hornfels
Metamorphic
     Hornfels
Coal
Lignite
Sedimentary
     Coal
          Lignite
Arenite
Sedimentary
     Clastic
          Sandstone
               Arenite
Mudstone
Shale
Sedimentary
     Clastic
          Mudstone
               Shale
Claystone
Sedimentary
     Clastic
          Mudstone
               Claystone
Sedimentary
     Coal
Sedimentary
     Clastic
          Mudstone
Diamictite
Greenschist
Argillite
Metamorphic
     Argillite
Sub-bituminous
Sedimentary
     Coal
          Sub-bituminous
Arkose
Sedimentary
     Clastic
          Sandstone
               Arenite
                    Arkose
Bituminous
Sedimentary
     Coal
          Bituminous
Mixed-clastic
Conglomerate-sandstone
Sedimentary
     Clastic
          Mixed-clastic
               Conglomerate-sandstone
Sedimentary
     Clastic
Chert
Sedimentary
     Chemical
          Chert
Slate
Metamorphic
     Slate
Zeolitic (prehnite-pumpellyite)
Tectonite
Cataclastite
Tectonite
     Cataclastite
Mylonite
Tectonite
     Mylonite
Plutonic
Gabbroic
Gabbro
Igneous
     Plutonic
          Gabbroic
               Gabbro
Quartz-latite
Igneous
     Volcanic
          Felsic-volcanic
               Quartz-latite
Latite
Igneous
     Volcanic
          Felsic-volcanic
               Latite
Lamprophyre
Igneous
     Hypabyssal
          Lamprophyre
Quartz-trachyte
Igneous
     Volcanic
          Felsic-volcanic
               Quartz-trachyte
Trachyte
Igneous
     Volcanic
          Felsic-volcanic
               Trachyte
Greenstone
Metamorphic
     Greenstone
Pluton
Granitic
Igneous
     Plutonic
          Granitic
Granite
Syenogranite
Igneous
     Plutonic
          Granitic
               Granite
                    Syenogranite
Dioritic
Quartz-diorite
Igneous
     Plutonic
          Dioritic
               Quartz-diorite
Monzodiorite
Igneous
     Plutonic
          Dioritic
               Monzodiorite
Tonalite
Igneous
     Plutonic
          Granitic
               Tonalite
Diorite
Igneous
     Plutonic
          Dioritic
               Diorite
Syenitic
Syenite
Igneous
     Plutonic
          Syenitic
               Syenite
Igneous
     Plutonic
          Dioritic
Igneous
     Plutonic
          Granitic
               Granite
Quartz-monzonite
Igneous
     Plutonic
          Syenitic
               Quartz-monzonite
Alkali-feldspar-granite
Igneous
     Plutonic
          Granitic
               Alkali-feldspar-granite
Granodiorite
Igneous
     Plutonic
          Granitic
               Granodiorite
Monzonite
Igneous
     Plutonic
          Syenitic
               Monzonite
Gabbronorite
Igneous
     Plutonic
          Gabbroic
               Gabbro
                    Gabbronorite
Norite
Igneous
     Plutonic
          Gabbroic
               Gabbro
                    Norite
Melange
Ultramafic
Peridotite
Igneous
     Plutonic
          Ultramafic
               Peridotite
Migmatite
Metamorphic
     Migmatite
Amphibolite
Metamorphic
     Amphibolite
Gneiss
Metamorphic
     Gneiss
Bentonite
Sedimentary
     Clastic
          Mudstone
               Claystone
                    Bentonite
Igneous
     Hypabyssal
Igneous
     Plutonic
          Dioritic
               Tonalite
Quartz-monzodiorite
Igneous
     Plutonic
          Dioritic
               Quartz-monzodiorite
Unit tends to be uniformly foliated and includes migmatite.  See NSA 1663
Includes tonalite and quartz diorite in part, see NSA 1662
Igneous
     Plutonic
          Gabbroic
Leucocratic-granitic
Pegmatite
Igneous
     Plutonic
          Granitic
               Leucocratic-granitic
                    Pegmatite
Gneissose plutonic rocks
Serpentinite
Metamorphic
     Serpentinite
Marble
Metamorphic
     Marble
Melange, matrix
Tectonite
     Melange
Calcareous
Sedimentary
     Clastic
          Sandstone
               Arkose
Sandstone-Mudstone
Sedimentary
     Clastic
          Mixed-clastic
               Sandstone-Mudstone
Calcarenite
Sedimentary
     Clastic
          Sandstone
               Arenite
                    Calcarenite
Classic pebble shale unit of North Slope, contains scattered, rounded and frosted quartz grains.
Volcaniclastic, volcanic breccia
Flow, pillows
Black-shale
Sedimentary
     Clastic
          Mudstone
               Shale
                    Black-shale
Coquina
Sedimentary
     Carbonate
          Limestone
               Coquina
Melange, blocks
Tectonite
     Melange
          Limestone
Tectonite
     Melange
          Ultramafic
Hypabyssal-basaltic-andesite
Igneous
     Hypabyssal
          Mafic-hypabyssal
               Hypabyssal-basaltic-andesite
Alkalic-volcanic
Igneous
     Volcanic
          Alkalic-volcanic
Monzogranite
Igneous
     Plutonic
          Granitic
               Granite
                    Monzogranite
Dunite
Igneous
     Plutonic
          Ultramafic
               Peridotite
                    Dunite
Alaskite
Igneous
     Plutonic
          Granitic
               Leucocratic-granitic
                    Alaskite
Igneous
     Plutonic
          Ultramafic
Trondhjemite
Igneous
     Plutonic
          Granitic
               Tonalite
                    Trondhjemite
Igneous
     Plutonic
          Granitic
               Leucocratic-granitic
Foidal-syenitic
Nepheline-syenite
Igneous
     Plutonic
          Foidal-syenitic
               Nepheline-syenite
Igneous
     Plutonic
          Syenitic
Schist
Metamorphic
     Schist
Glaucophane-schist
Metavolcanic
Metamorphic
     Metavolcanic
Sedimentary
     Clastic
          Mixed-clastic
Metasedimentary
Metamorphic
     Metasedimentary
Quartzite
Metamorphic
     Quartzite
Siltstone-Mudstone
Sedimentary
     Clastic
          Mixed-clastic
               Siltstone-Mudstone
Sedimentary
     Argillite
Igneous
     Volcanic
          Mafic-volcanic
               Latite
Sandstone blocks
Conglomerate blocks
Pillow basalt and chert blocks
Tonalite and greenstone blocks
Metamorphosed turbidites
Metamorphosed turbidites -- flysch
Metamorphosed mafic flows
Metamorphosed mafic flows and flysch(?)
Numerous limestone concretions
Numerous large limestone concretions
Phosphatic-shale
Sedimentary
     Clastic
          Mudstone
               Shale
                    Phosphatic-shale
Phyllite
Metamorphic
     Phyllite
Gray, green, and black phyllite, fine-grained tuff, and tuffaceous chert.
Commonly serpentinized
Pyroxenite
Igneous
     Plutonic
          Ultramafic
               Pyroxenite
Monzogabbro
Igneous
     Plutonic
          Gabbroic
               Monzogabbro
Melilitic
Igneous
     Plutonic
          Melilitic
Orthogneiss
Metamorphic
     Gneiss
          Orthogneiss
Diabase
Igneous
     Plutonic
          Gabbroic
               Diorite
Limestone and basalt which grades southwestward into interbedded gray limestone, dark-green pillow basalt, massive and locally semischistose basaltic tuff, calcareous sandstone, and minor black chert and silty limestone.
Lense
A long narrow belt of unfossiliferous, massive to thick bedded, white to light gray, fine grained marble.
Dark-gray banded spiculite and chert, yellowish-orange-weathering sandy fossiliferous limestone and conglomerate and dark-gray shale
Carbonaceous
Oil-shale
Sedimentary
     Clastic
          Mudstone
               Shale
                    Oil-shale
Red beds
Dolostone
Sedimentary
     Carbonate
          Dolostone
Fault-bounded lenses
Intrusive-carbonatite
Igneous
     Plutonic
          Intrusive-carbonatite
Magnetite-rich
Incredibly thick and distinctive rock unit
Low greenschist facies
Weakly metamorphosed
Metamorphosed
Metamorphosed volcanic and volcaniclastic rocks
Amygdaloidal metabasalt
Medium-bedded dark brown limestone and sooty carbonaceous limestone
Black chert
Carbonaceous turbidites
Pillow basalt, volcanic breccia, and banded rhyolite form lateral and overlying facies to limestone, argillite, and volcanic sandstone.
Basaltic pillow breccia and pillow lava flows, andesitic volcanic breccia, aquagene tuff, tuff breccia, minor thin bedded limestone
Olistrostrome
Mostly matrix supported deposits representing debris flows.
Volcanic clasts
Thick-bedded oolitic limestone
Dark gray to black carbonaceous, rhythmically bedded argillite
Slightly metamorphosed basalt having relict pillows
Semischistose metagraywacke, loccally pebbly metagraywacke, metatuff, metamudstone, and conglomerate
Semischistose metagraywacke, locally pebbly metagraywacke, metatuff, metamudstone, and conglomerate
Hornblendite
Igneous
     Plutonic
          Ultramafic
               Hornblendite
Dominantly dark-gray, typically phyllitic, silicieous to carbonaceous argillite and shale, having subordinate but characteristic clast-supported chert-rich conglomerate, greenish-gray chert, tuffaceous volcaniclastic rocks, yellowish- to reddish-brown hi
Volcaniclastic rocks not seen in Brooks Range exposures
Anorthosite
Igneous
     Plutonic
          Anorthosite
Paragneiss
Metamorphic
     Gneiss
          Paragneiss
Metabasite
Quartz-gabbro
Igneous
     Plutonic
          Gabbroic
               Quartz-gabbro
Dark-greenish-gray massive-weathering mafic volcanic rocks that include pillow basalt, breccia, agglomerate, tuff, and massive basalt flows.  Volcanic rocks commonly contain interbeds of black phyllite, chert-pebble conglomerate, light-green tuff, and gr
Chiefly light- to dark-gray fine-grained quartz-mica schist and grayish-black phyllite.  Subordinate calcareous schist, limestone, chlorite schist, and amphibolite schist.
Dark-gray to black phyllite with subordinate fine-grained metagraywacke
Primarily consists of metamorphosed flows and tuffs of basaltic and andesitic compositions.  Mudstone, bioclastic marble, and dark-gray to black phyllite are subordinate.
Weakly metamorphosed, cherty
Quartz-syenite
Igneous
     Plutonic
          Syenitic
               Quartz-syenite
Metavolcanic schist
Conglomerate-mudstone
Sedimentary
     Clastic
          Mixed-clastic
               Conglomerate-mudstone
Medium to thick, well-bedded dolomite and limestone with local black chert nodules and thin irregular chert beds; locally metamorphosed to marble and strongly sheared;
Is this metamorphic?
Some descriptions indicate 75 percent limestone and 25 percent shale
Strong petroliferous odor.  Coarse-grained limstone debris-flows having clasts of algal boundstone reef material common in uppermost part of unit
Middle Endicott Group, Kanayut conglomarate (Upper Devonian and Lower Mississippian) - Nonmarine sandstone, conglomerate, and shale with minor marine tongues.  Noatak sandstone (Upper Devonian) - Marine, partly calcareous, sandstone, and shale.
Metamorphic
     Phyllite
          Siltstone
Locally metamorphosed to greenschist facies
Dark-greenish-gray, fine- to coarse-grained augite- and hornblende-bearing mafic diorite and gabbro.  Regionally metamorphosed (greenschist facies)
Metaconglomerate
Chiefly schistose, fine-grained metaandesite tuff and flows, and coarse-grained breccia and conglomerate, along with minor dark-gray argillite.
Amphibolite, epidote-amphibolite
Very light gray to brownish red weathering resistant schistose felsic volcanic rocks
Metamorphic
     Slate
          Chert
Sheared and foliated quartz and quartz-feldspar grits and quartzite intercalated with quartz-muscovite-chlorite and quartz-muscovite-biotite schists.  Subordinate phyllite, thin limestone, and metachert.
Slightly to moderately metamorphosed graphitic siltite, slate, graywacke, and calcareous siltite.
Medium- to coarse-grained, massive, and well-foliated biotite-hornblende gneisses, garnetiferous amphibolites, quartz-mica schists, and marble.
Chloritic schists and marble schists.
Retrograded
Schistose limestone.
Dark schistose limestone
Chloritic schist
Marble and calc-silicate rocks.